Territory



(No Model.) I

FLUE FOR STEAM BOILERS. v No. 426,922. Patented Apr. 29, 1890.

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UNITED STATES PATENT OFFICE.-

WILLIAM COOK, OF SALT LAKE CITY, UTAH TERRITORY.

FLU E FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 426,922, dated April 29, 1890.

Application filed June 20,1889. Serial No. 314,932. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM 000K, of Salt Lake City, Salt Lake county, in the Territory of Utah, have invented a newand useful Improvement in Multitubular Flues for Steam- Boilers, of which the following is a specification.

My invention relates to an improved construction of the kind of boilers employed for 1o locomotive and otherportable steam-engines,

- in which the heated products of combustion are conveyed from fire-chamber to smokestack through numerous small tubes.

Among useful results believed to accrue from said invention are facility of construction and of removal, inspection, and substitution of flue-tubes, and better bracing, and avoidance of strain of the tube-sheets, thus enabling a greater steam-pressure with even greater safety.

In the accompanying drawings, Figure l is a partially-sectioned side elevation of aboiler embodying my invention. Fig. 2 shows portions of a flue-tube to full size, the ferrule being partly in section. Fig. 3 is a section on line 3 3.

1 may represent the firechamber; 2, tubesheet of same; 3, Water and steam space; 4, box or receiving-chamber of smoke-stack 5.

o 6 represents tube-sheet of said smoke-box. The flue-tubes 7 have the customary lip or flare8at their receiving ends to engage around the margin of the flue-holes in the tube-sheet 2. The delivery ends of said tubes extend somewhat through the tube-sheet 6 and are screw-threaded e-Xteriorly, as at 9, for an interiorly-threaded ferrule 10, preferably of brass or other non -corrodible metal. Orifices 11 in said ferrule serve as passages for oil to the threaded surfaces to facilitate the unscrewing of the ferrule from a tube which it may be desired to remove or the tightening or slackening of a ferrule where found necessary.

The junctions of the flues with the tube- 5 sheets are made steam-tight by the following means: A groove (see dotted lines 8) on the inside of the lip 8 forms an annular chamber for any suitably soft and refractory packingsuch as a copper or asbestus gasket-at the junction of the fines with the tube-sheet 2. Alike annular chamber 10 in the ferrule is provided for a similar gasket or packing at the junction of the fines with the tube-sheet I claim as new and of my invention A flue-tube of a steam-boiler whose receiv-' ing end has a retaining-lip formed with an annular chamber 8 for a packing-gasket at the junction of the receiving end of the flue with the tube-sheet 2, and whose delivery end extends beyond the flue-sheet for a screwthreaded retaining-ferrule formed with an annular chamber 10 for a packing-gasket at the junction of the flue with the tube-sheet 6.

In testimony whereof I affix my signature in presence of two Witnesses.

. WILLIAM COOK. Witnesses:

ALBERT E. BUOKWELL, E. J. GARDNER. 

